﻿
/*
 * Copyright 2012, 2013 by Mario Vernari, Cet Electronics
 * Part of "Cet Open Toolbox" (http://cetdevelop.codeplex.com/)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace Cet.IO.Hashing
{
    /// <summary>
    /// Hashing algorithm for calculating the LRC
    /// </summary>
    public class HashLrc
        : HashAlgorithmBase
    {
        /// <summary>
        /// Calculate the hashing over a segment of a byte array
        /// </summary>
        /// <param name="buffer"></param>
        /// <param name="offset"></param>
        /// <param name="count"></param>
        /// <returns></returns>
        public override int Compute(
            byte[] buffer, 
            int offset, 
            int count)
        {
            int lrc = 0;
            while (--count >= 0)
                lrc ^= buffer[offset + count];

            return lrc;
        }

    }
}
